Teermometek



(No Model.) A 2 Sheets-Sheet 1. D. DEAPER.

EEGURDIEG THERMOMETER.

- No. 369,170. Patented Aug. 30,1887.

(No Model.) 2 Sheets-Sheet 2. D. DRAPER.

` EEOUEDING THERMOMETER. No. 369,170. Y:Paten ed Aug. 30, v1887.

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UNITED STATES PATENT OFFICE.

DANIEL DRAPER, OF HASTINGS UPON HUDSON, ASSIGNOR TO THE DRAPER MANUFACTURING COMPANY, OF NEV YORK, N. Y.

RECORDING-THERMOMETER.

SPECIFICATION forming part of Letters Patent N. 369,170, dated August 30,A 1887.

Application filed January 25. 1887. Serial No. 225,421. (No model.)

To all whom it may concern.-

Be it known that I, DANIEL DRAPER, a citizen of the United States, residing in Hastings upon Hudsomin the county of Westchester and State of New York, have invented certain new and useful Improvements in Recording-Therc mometers, of which the following is a specification.

The invention relates to the -class of apparatus employed for giving a continuous register of the variations in temperature at any given point; and the object of the invention is to provide reliable, efficient, and certain means for giving a record of permanentcharacter, and which is exposed to view at all times during the period covered by the record-cards.

The invention consists, in general terms, in placing upon asuitable arbor, driven at a constant speed by a clock-train, a card upon which the record is to be made.- This card is divided into sections by lines radiating-from the center, which divide it into days and hours, and, if desired, fractions thereof, and by concentric circles which serve to indicate the different degrees of temperature. Upon this card there rests arecording-pen, which is carried upon an arm moved toward and from the center of the card by the effects of variations in the temperature. The arm is carried upon an arbor supported in any convenient manner from a rigid back or frame, carrying also the clock mechanism; and this arbor is moved in one direction or the other by the combined action of two thermostatic strips as they are affected by the variations in the temperature. These strips are secured at one end to the frame or support, while to the free ends the respective ends'of a ne wire, thread, or chain are fastl cned. This wire passes over the face of a segment lever secured to the arbor, so that under an increased temperature the thermostatic strips combine to move this lever in one direction by carrying the ends of the cord or wire in a corresponding direction, and to move it in the opposite direction under the iniiuence of a decreased temperature by carrying the ends of the wire in the opposite direction.

The invention will be describedin detail in connection with the accompanying drawings,

5o in which surface of the chart.

partlyT in section; and Fig. 2 is a side view of the same, also partly in section.

Referring to the figures, A represents asuitable frame, preferably of cast-iron, constructed with a main portion, a, carrying a box, B, containing a clocktrain, which is preferably an eight-day movement, or even of greater capacity. Upon the hour-hand arbor b of this clocktrain there is carried a plate, C. This plate carries at its center a pin, c, and at a point a little remote form the center a second pin, c', also, at its edge three or more clips, c2, c3, and c4. These are designed to hold the chart D in place. This chart is adapted to receive the record of the variations in the temperature for a period of one week. When the chart is to bev put upon the plate, the central pin, c, is

pushed through the central point of the chart, and the edges of the chart are slipped under the clips cz c3 c4, while the pin c passes through a corresponding point on the chart andprevents it from being turned upon the plate. The chart is divided by radial lines d d cl into seven divisions, representing the seven days of the week, and by intermediate lines, d d', into hours of the days. Goncentric lines e e divide the chart into other divisions, which serve to indicate the different degrees of temperature. The lines d d and d d' are preferably curved to correspond with the arc described f by an arm, F, when it turns upon the center. This arm F carries at its end a recording-pen, f, consisting, preferably, of a piece of metal or other suitable material of V-shaped cross-section, cut away to form a point at the place where it bears against the the required rigidity and prevent any lateral movement, except as its laxis or support g is turned. The resiliency of the arm holds the 'pen against the chart.

The arbor g is carried in a suitable frame or yoke, Gr, securely fastened to the rigid back It is designed that asufplate or frame, A. The spring-arm F is fastened upon this arbor by being bent into a yoke at its end, as shown at f, and the arbor therefore passes through two portions of the arm, holding it rigid. It may then be brazed or otherwise securely fastened.

The two ends of the arbor g bear in suitable journals or openings in the frame. The arbor carries a lever, H, secured thereto, and terminating in a widened end, the surface of which is curved to the arc of a circle described upon the axis of the arbor. The face of this arc is preferably recessed or made slightly concave, and receives a thin wire, 7L. This wire :is fastened at one end to a thermostatic strip, K', and passes across the face of the are, from which it is carried to and around the shaft of a thumb-serew,N, extending through the lever, and from this pointitextends around the other end of the are and across its face to the end of a second thermostatic strip, K2. rlhe two free ends of the strips K and K2 are thus bent together by means of this wire, and any movement of one is necessarily communicated to the other. By means of the set-screw N the tension of the wire may be adjusted, for by turning the screw more or less the wire will be bent to a greater or less extent upon the shaft of the screw.

The wire is attached to the respective thermostatic strips by means of suitable hooks or other equivalent devices, L' k2. The other ends of the respect-ive strips are secured rigidly to the support A, or to the box B by means of screws, or in any other suitable manner, upon opposite sides of the clock-train, and they extend upon opposite sides of the arbor g and the lever H. rIhe strips are constructed in any wellknown manner of two metals brazed, soldered, or in any other suitable mauner fastened together, and they are so placed in reference to each other that any variation in the temperature will cause the free ends of both strips to move in the same direction, whereby they combine to assist in moving the lever H, and thus the recording-arm F.

It has heretofore been proposed to employ a single thermostaticstrip for movingarecording-lever in the same general manner as that described herein; but in such a ease it is necessary to employ a yoke at the end of the strip for carrying the ends of the wire. Such yoke is dispensed with in this organization, and the two thcrmostatie strips not only act to produce the record, but by their resilience keep the wire always at an even and proper tension. This construction also, for the same reason, serves to prevent any injury being done to the instrument or its adjustments when it is being transported. A small setscrew, g2, passes through the frame Gbeneath the arbor, and is employed for adjusting and holding the arm F in position.

The whole instrument is covered and protected by a light frame, which may be perforated or otherwise adapted to allow the free access of air and permit the changes of tempcrature to freely and quickly act upon the thermostatic strips. A glass plate ycovers the dial, thus leaving it always visible.

I claim as my invention- 1. The combination, with a clock-train and a thermometrical chart, of a recording-arm, an arbor carrying the same, a lever` upon the arbor, two thermostatic strips, and connections betweenthe same and said lever.

2. In a recording-thermometer,the combination, with a clock-movement, of two thermostatic strips, a recording-lever, and a mechanical connection between said lever and both of 8o said strips.

3. In a recording-thermometer,the combination oftwo thermostatic strips, a recording-dial, and means for revolving the same at a constant rate, of a recording-arm applied thereto, an arbor carrying the same, the lever H, having its face formed in the arc of a circle, a wire or other mechanical connection having its ends brought over'the face of said lever and fastened to the respective thermostatic stri ps, substantially as described.

4. The combination, in a recording-thermometer, of a recording-arm, two thermostatic strips combining by the effects of variations in temperature to move the arm in one direction 95 or the other, a metallic wire or other mechanical connection connecting the free ends of the two thermostatic strips, and a connection between thc same and said recording-arm.

5. In a recordilig-thermometer,the combina' roc tion, with two thermostatic strips, of a recording-arm actuated thereby, and a connection between the strips and the arm, consisting of a lever moving with the arm having a curved face, a wire or equivalent device having its rc5 ends brought past each other upon said face, and a set-screw engaging an intermediate portion of the wire.

6. In a recordingthermometer, thecombination of the back plate or support, A, the clock- I Io train and dial-plate supported thereby, the bracket G, secured to said back plate,a curved faced lever and its arbor supported in said bracket, and the thermostatic strips secured to said support, and having their free ends connectedwith each other and with said lever,sub stantially as described.

In testimony whereof I have hereunto subscribed my name this 24th day of January, A. D. 1887.

DANIEL DRAPER.

\Vitnesses:

LEIGHTON WILLIAMS, MORNAY W1 LLiAMs. 

